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Schedule of Deferred Compensation Amount Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Debt Disclosure [Abstract]    
Deferral elections outstanding $ 15,996 $ 15,732
Current portion of deferral elections 1,015 1,238
Long-term portion of deferral elections $ 14,981 $ 14,494